In small-town Wisconsin, looking for the roots of the modern American conspiracy theory

It’s a place where army-style buzz cuts are still in fashion, communism remains the primary enemy and the decor is dominated by American flags and portraits of once-famous Cold Warriors. At the John Birch Society, they’ve been waging war for more than 60 years against what they're sure is a vast, diabolical conspiracy. As they tell it, it’s a plot with tentacles that reach from 19th-century railroad magnates to the Biden White House, from the Federal Reserve to COVID vaccines.